Titanium alloys investigation
That (Ti75%Cu25%) is perfect sample - strongest and solid practically without cavities.
That (Ti90%Ag10%) has cavities - mostly because of low silver. Probably with 20-25% it could be solid, more heavy and strong. Longer time in oven (around 820C) can help to reduce patches of not solidified grains.
- That is 2000 years old technology sample (nothing new in this world) - solid, strong, and non expensive (0.5-0.8 cents per cm^3). Probably that can bring bronze age back to houses.
And needs to find the (easy) way to measure all mechanical parameters of alloys.
Existing paste extruders has that limitations:
- Material for printing limited by a syringe size (10-20 -200 cm^3)
- It is hard to make the small diameter extrusion - viscosity is high.
Probably needs to make the screw extruder. Dry powder is delivered by vibration via the plastic tube (thus less inertia parts for positioning mechanism). Once debugged using dry powder, so through the central part (with ball valve) delivers pressurized water with PVA - water. Ratio liquid / powder adjusted by (a) turning speed of the screw, and (b)the water's pressure. Small 100$ desktop compressor with an automatic pressure control will be preferable.
For the beginning the mold 3D printed from the plastic (for extruder) can be made. Then next step will be to 3D print the extruder itself.
Design with two extruders can allow combining two metals with different heat conductivity and strength.
see more on - http://reprap.org/wiki/TitaniumAlloy